"""
Offer sun based automation rules.

For more details about this automation rule, please refer to the documentation
at https://home-assistant.io/components/automation/#sun-trigger
"""
from datetime import timedelta
import logging

import voluptuous as vol

from homeassistant.const import CONF_PLATFORM
from homeassistant.helpers.event import track_sunrise, track_sunset
import homeassistant.helpers.config_validation as cv

DEPENDENCIES = ['sun']

CONF_OFFSET = 'offset'
CONF_EVENT = 'event'
CONF_BEFORE = "before"
CONF_BEFORE_OFFSET = "before_offset"
CONF_AFTER = "after"
CONF_AFTER_OFFSET = "after_offset"

EVENT_SUNSET = 'sunset'
EVENT_SUNRISE = 'sunrise'

_LOGGER = logging.getLogger(__name__)

TRIGGER_SCHEMA = vol.Schema({
    vol.Required(CONF_PLATFORM): 'sun',
    vol.Required(CONF_EVENT):
        vol.All(vol.Lower, vol.Any(EVENT_SUNRISE, EVENT_SUNSET)),
    vol.Required(CONF_OFFSET, default=timedelta(0)): cv.time_period,
})


def trigger(hass, config, action):
    """Listen for events based on configuration."""
    event = config.get(CONF_EVENT)
    offset = config.get(CONF_OFFSET)

    def call_action():
        """Call action with right context."""
        action({
            'trigger': {
                'platform': 'sun',
                'event': event,
                'offset': offset,
            },
        })

    # Do something to call action
    if event == EVENT_SUNRISE:
        track_sunrise(hass, call_action, offset)
    else:
        track_sunset(hass, call_action, offset)

    return True